linux-kernel - Re: [BUGFIX][PATCH] memcg: fix page_cgroup fatal error in FLATMEM (Was Re: boot panic with memcg enabled

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Date:	Fri, 12 Jun 2009 09:21:52 +0300
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Li Zefan <lizf@...fujitsu.com>, linux-kernel@...r.kernel.org,
	mingo@...e.hu, hannes@...xchg.org, torvalds@...ux-foundation.org,
	yinghai@...nel.org, Balbir Singh <balbir@...ux.vnet.ibm.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: [BUGFIX][PATCH] memcg: fix page_cgroup fatal error in FLATMEM 
	(Was Re: boot panic with memcg enabled

On Fri, Jun 12, 2009 at 8:34 AM, KAMEZAWA
Hiroyuki<kamezawa.hiroyu@...fujitsu.com> wrote:
> From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
>
> Now, SLAB is configured in very early stage and it can be used in
> init routine now.
>
> But replacing alloc_bootmem() in FLAT/DISCONTIGMEM's page_cgroup()
> initialization breaks the allocation, now.
> (Works well in SPARSEMEM case...it supports MEMORY_HOTPLUG and
>  Size of page_cgroup is in reasonable size (< 1 << MAX_ORDER.)
>
> This patch revive FLATMEM+memory cgroup by using alloc_bootmem.
>
> In future,
> We stop to support FLATMEM (if no users) or rewrite codes for flatmem
> completely. But this will adds more messy codes and (big) overheads.
>
> Reported-by: Li Zefan <lizf@...fujitsu.com>
> Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>

Looks good to me!

Acked-by: Pekka Enberg <penberg@...helsinki.fi>

Do you want me to push this to Linus or will you take care of it?
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